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Two smooth spherical non conducting shel...

Two smooth spherical non conducting shells A and B each having radius R hving uiformly distributed charge Q amd -Q on their surface are released from rest on a smooth non conducting surface.When distance between their centre is 10R,The mass of A is m and that o B is 2m ( neglecting gravitational attraction) .What is the speed of A just before it collides with B?

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